Insulating-joint.



C. WIRT. INSULATING; JOINT. AFPLIGATIQN FILED 193.244, 1907.

1,640,9. Patented 00e. s, 1912,

W'itnesses Inventor Mw@ ma,

UNITED syn/#rains PATENT onirica.

CHARLES WIR'I, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGN MENTS, TO WIRT ELECTRIC SPECIALTY COMPANY, A CORIORATION OF MAINE.

INSULATING-J'OINT.

Specification of Letters Patent.

Patented Oct. 8, 1912.

To all whom 'it may concer/n.:

- Be it known that I, CHARLES VVIRT, a citi- My invention relates tol 4 insulating` connections and is particularly useful with reference to insulating joints which are employed4 foi` supporting electric fixtures or combined gas andelectric fixtures.

The general object of my invention is to provide .a new and improved insulating joint, which is simple in construction, slall in size and convenient in use, and which at the. same time has great strength'and durability.

To the above end my invention in general comprises an insulating joint consisting-of a continuous outer shell, having end openings larger than the greatest diameter ofthe inner members, inner members therein,.and insulating material which is linterposed between said inner members and vthe inside of said shell and which is subjected toa shearof outside member or shell, and Fig. 6 isav ing strain when the device is in use.`

My invention will be understood from the following description and accompanyingl drawings, in which certain embodiments thereof are set forth.

In the drawings, Figure 1 is a side view4 of a .joint embodying myinve'ntion, Fig. 2 1s a' section thereof on the line A A, Fig. 1, Fig. 3 is a section onthe line B-Y B,Fig. l2, Fig.. 4 is aside elevation of a modification, Fig. 5 is a sectional view of-a modified form side elevation of a modified form o finner member or pipe thimble.

In allI of the views, like parts are designatedv by the same reference characters.

Injthe embodiment of my invention herein illustrated I provide an outerxmember, casingI or shell 1 and two inner members or pipe thimbles 2, 2. These inner members are of such a size that they are readily 1nserted in th shell. Between the shell and the inner members is an insulating filling 3. Between the two inner members or pipe thimbles are disks' or washers 4 of mica. 'The inner members or pipe thimbles 2, 2 are screw-threaded as shown, for attachment of the joint to the pipe and for attachment of the xture to the joint. In Fig'. 3 the embodiment shown is a gas joint, holes being bored through the closedends of the thimbles and the disks being provided with central perforations as shown. In .a blind joint, unperforated disks will be employed and the ;thimlo1es will [have no openings through them.

The inner 'wall of the outer 'member or shell l is provided' with means to resist displacement at more than one angle, such means particularly resisting longitudinal and torsional shearing stresses. The outer vwalls of the inner members or pipe vthimbles .2, 2 are provlded with means for resisting longitudinal and torsional shearing stresses.

These means may be variously formed. In. Figs. l, 2 and 3, the outer member or shell l is provided with longitudinal corrugations 5. yIn addition to these there are transverse corrugations 6. The shell shown in Figs.

ll, 2 and 3, is made of sheet metal stamped to shape; consequently the corrugations 5 and 6 are reproduced uponthe outside of the shell. Furthermore, as the metal is too thin to have both longitudinal and transverse depressions occupy the entire surface `of the outer member or shell, they are shown as each occupying separate portions thereof. The longitudinal corrugations 5 occupy the center portion of the shell, while the transverse depressions occupy the extremities. In the4 modification sho-wn in Fig. 5, theshell is formed of a malleable casting. The longitudinal depressions and projections and the transverse depressions and projections cross one another and cover the entire inner wall of the shell. In the modification shown in 4, the longitudinal depressions are made by a'series of bosses struck out from the inside of the shell near the center. The transverse depressions are made by crimping in or bending in the edges of the shell.

As already stated, the inner members or pipe' thimbles 2 are provided lwith means to resist longitudinal and torsional shearing strains. These means, as shown, consist of transverse grooves 7 (see Fig. 6) {extending throughout the whole, Ior nearly the whole,

,of the length of the thimble, vlongitudinal insonni ytially as set forth.

.3. An insulating joint having a shell, two

' linner members therein, and an insulating filling between ,the inner membersv and the shell, the shell having longitudinal depres- 'sionsv near the middle portion and transverse depressions nearer the ends, the longitudinal depressions serving to resist torsional strains and the transverse depressions serving to rez sist longitudinal strains.

-tinuous shell provided with .end openings,

f ,4. An; insulating connection haviiig'a'eonone at least being larger than the greatest diameter of the inner members, two inner members of asize to be readily insertible through an end of the shell. and insulating material molded into the space between said 4vshell and r'said inner members.

5. An insulating connection having a con- 1 tinuous shell provided-with end openings,

one at least being larger than the greatest diameter of the inner members,- two inner members offa size to be readily .insertible through an Aend of the shell., insulating inaterialmolded into the space between said shell and said inner members, and means on the shell and inner members, cooperating withthe insulating material to subject the latter to a shearing strain when the device is in use.

6. An insulating connection having a continuous shell rovided with end o eninfrs one at least being larger than the-greatest diameter of the inner members, two inner members` of a size to be readily insertible through an end of the shell, la .disk of insulating material between the said inner two members, and insulating material molded -into the space between said shell and said inner members. 7. An insulating connection having a continuous shell provided with end openings, one at least being larger than the greatest diameter of the inner members, two inner members of. a size to be readily insertible through an end of the shell, a disk of insulating material between said inner two mem bers, insulating material molded into the space between -said shell and said inner members, and means on the shell and inner members, eoperating with the insulating material to subject the latter to a shearing strain when the deviee is in use.

This specification signed and witnessed this 27 th day of March, 1907.

CHARLES VVIRT. 

